Limit-stop for hoisting-drums



(No Model.)

' T. W. HEE'RMANS.

LIMIT STOP FOR HOIS TING DRUMS.

No. 364,111. Patented May 31,18 1

1 N1 PEiERS. PhMo-Lilhognpher. wnmn' lan, 01 c.

"UNITED STATES PATENT OFFICE.

THADDEUS W. HEERMANS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE CRANEELEVATOR COMPANY, OF ILLINOIS. I

LIMIT-STOP FOR HOISTING-DRUMS SPECIFICATION forming part of LettersPatent No. 364,111, dated May 31, 1887. Application filed August 9.1886.Serial No.2l0,-i92. (No morlcl.) I

To all whom it may concern:

Be it known that I, THADDEUS W. HEER- MANS, of Chicago, in the county ofCook and State of Illinois, have invented a new and use- 5 fulImprovementin Elevators, of which the fol lowing is a full description.

The function of my invention is the prevention of the overrunning ofthelimits of the hoist by the cage; and it consists in an improveddevice for automatically bringing the engine nuerringly and positivelyto rest when the elevator car or cage has reached the top or bottom ofthe shaft. The requisites ofa device for this purpose are,'that it shallbe easily ad- 1 justed for any length of hoist, shall be so simple andstrong as to reduce the liability to derangement to the minimum, andshall be so adjustable to the speed of the engine, when the latter isstarted, stopped, and reversed by a single lever, as that it may bringthe controlling-leverto a central positiomand not beyond, as in thelatter event the engine would be reversed or start in the oppositedirection. To combine these requisites in larger measure than 2 5heretofore, and specially to guard against the reversal of the engine,is the object'of myinvention.

The drawing shows a side view of my stop and so much of ahoisting-engineas is necessary 0 to show its attachment thereto.

A is a disk, which revolves on the stud D,attached to the frame F of thehoisting-drum.

B is a T-slot containing the stopsor studs '0 O, which may be made fastin any part of the slot. The disk A receives motion from the shaft G ofthe hoisting-drum through the worm and gear g h and bevel-gears t'j, orother suit able gearing, it being only necessary that the ratio of themotion of the shaft G and disk A 0 should be such that the greatestelevation of the elevator should correspond with less than a completerevolution of the disk A. The ratios of the gearing, which isintermediate between the hoister-shaft and the disk 5 A, necessary todrive the disk Ain the manner just specified, can be easily determinedwhen the number of revolutions of said shaft corre sponding to theextreme travel of the cage is known. The revolutions of said shaft mayin like manner be ascertained or determined when the extreme travel ofthe cage and the diameter of the drum are known or fixed upon.

.Pivoted upon the stud D is the lever E,slotted at e and connected bythe link Hto thelever I, controlling the engine through a slidevalve ofsuch construction as that, when the lever and valveare central, steamisshut off from the cylinder, and a movement ofthe valve on either side ofthe central position produces a corresponding movementoftheengineinone6c or the other direction. This valve and its steam-chest are shown inUnited States Patent No.133,926, to O. S. Crane. A series of holes,

Z Z, and the slot e allow the adjustment of the link H, so as to vary.the relative movements 6 of leversE and I, as hereinafter explained.

The lever I is steadied by the upright O, and

is limited to a proper length of movement by the stops 1? P. .Neitherupright 0 nor stops P are essential. 7C

- The connection J, cam K, lever L, and weight M operate the band -brakeN, so that the brake is applied automatically'when thecontrolling-leverlisin its middle position. It as:

' sists the'action of the stop in bringing the en- 5 gineto rest withoutreversal, but forms no part of the present invention, and is notessential to its operation.

The operation of the stop isas follows: Supposing the elevator to be atthe top ofthe shaft, I

to deseend,the lever I is raised to the position indicated by dottedlines by the operator through any of the ordinary lever or ropeattachments, such as the hand rope passing through the car or any of theequivalents therefor. As the cage descends the disk A revolves in thedirection shown by the arrow, and on the approach of the cage to thebottom of the shaft the stop 0 comes in contact with the lever E,carrying it and the lever I to the posi- 0 tion shown in full lines, inwhich steam is entirely shut off and the engine is at rest. The movementof the levenI is so timed that the momentum of the parts is j ustsufficient to carry the lever to its central position after steam is 9 5shut off, but is not so rapid as to pass the central position andreverse the engine. This ad justnnent is effected by shifting the link Hin the slot e and to corresponding holes, Z, in lever I. The stop Gcomes into action when the cage reaches the top of the shaft, its actionbeing similar to but in the reverse direction of the stop 0. v

I have thus specifically described my invention in its application to ahoisting-engine controlled by a peculiar arrangement of lever and valve;but I do not wish to be restricted to its use in this connection only,forit is capable of adaptation to any hoisting-engine, whether operatedby the ordinary link-motion or other reversing device, connection beingmade either with the reverse lever or the stop-valve, if one be used, asmay be desired.

Various modifications of thelever Eand disk A may be madewithoutdeparting from my invention-as, for example, the lever E might bepivoted outside the disk A, projecting over the latter only enough toallow the stop to act upon it. The disk A could in many cases be reducedto a sector; and other modifications of details will occur to theskilled mechanic, or be sug gested by the application of the stop toother forms of engines, the essential features of the stop being thedisk geared in the ratio to the hoistingshaft previously described, andcarrying stops which act through an intermediate lever, which may beadjustable on the controlling lever or valve of ahoistiug-engine.

I claim-- 1. In alimit-stop for hoisting-machines, the slotted disk A,stops 0 O, and' the lever E, adjustabl y connected to thecontrolling-lever, all combined to operatesubstantially as shown anddescribed. I

2. In combination, aslotted disk geared to the hoisting-drum in theratio described,provided with stops, an intermediate lever, and the controlling-leverofahoisting-engine,substantially as described.

3. Theslotted disk A,geared to the hoistingdrum in the ratio describedand carryingstops C O, in combination with the lever E, thecounecting-link H, and the controlling-lever of the engine,substantially as described.

THADDEUS W. HEERMANS.

Vitncsses:

J. I. VEEDER, P. H. T. M ASON.

